FRACTURE CHARACTERISTICS OF STRUCTURAL METALS.
Final rept. for 22 Jan 64-22 Jan 65,
TRW INC CLEVELAND OHIO
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An examination was conducted to determine the applicability of plane strain fracture toughness values, K SUB IC, as a possible handbook design parameter. The program included compilation of available data on plane strain fracture toughness, measurement of K sub IC for a variety of materials to supplement existing data, evaluation of influence of test method on K sub IC, and determination of certain processing history and section size effects on K sub IC. Fracture toughness measurements indicated that reasonable agreement can be obtained from tests conducted with various specimen geometries. Although K sub IC values reported from different laboratories showed considerable scatter, due presumably to variations between heats of material, definite differences in material classes could be distinguished. On this basis, K sub IC can serve as a relative rating parameter which would aid in material selection. In addition, quantitative estimates can also be made of the load-carrying capacity of components containing possible defects. Author